857664900385 has 32 divisors (see below), whose sum is σ = 1089309513600. Its totient is φ = 646461504000.

The previous prime is 857664900377. The next prime is 857664900427. The reversal of 857664900385 is 583009466758.

It is not a de Polignac number, because 857664900385 - 2³ = 857664900377 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 16116501 + ... + 16169629.

It is an arithmetic number, because the mean of its divisors is an integer number (34040922300).

Almost surely, 2^857664900385 is an apocalyptic number.

It is an amenable number.

857664900385 is a deficient number, since it is larger than the sum of its proper divisors (231644613215).

857664900385 is a wasteful number, since it uses less digits than its factorization.

857664900385 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54081.

The product of its (nonzero) digits is 43545600, while the sum is 61.

The spelling of 857664900385 in words is "eight hundred fifty-seven billion, six hundred sixty-four million, nine hundred thousand, three hundred eighty-five".